[FEATURE] Update Default guess_max Arg to Inf

[rsh52]

Feature Request Description

After implementing the guess_max argument in #144, a default setting was applied as .Machine$integer.max. Instead, we want the default to be Inf.

This is currently blocked by the CRAN REDCapR v1.1.0 use of assert_integerish:

https://github.com/OuhscBbmc/REDCapR/blob/efd8a749ffb6333a6856fb195e7de5bb4b9b8b26/R/redcap-read-oneshot.R#L214

It seems like the latest dev version has dropped this assertion. Once it's on CRAN, we should update here as well.

Additional Context

Summary: Update default guess_max to Inf with next release of REDCapR.

Checklist

• [x] The issue is atomic
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